A machinist with normal vision has a near point at 25 cm. The machinist wears eyeglasses in order to do close work. The power of the lenses is +1.75 diopters. With these eyeglasses, what is the near point of the machinist?
A) 24 cm B) 14 cm C) 21 cm D) 17 cm E) 10 cm
D
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LR Circuits: As shown in the figure, a circuit consists of a resistor R = 18 ? in series with an ideal inductor L = 33 H having no resistance. At time t = 0 s, there is a 12-A current in the circuit. When the magnetic energy of the inductor is 1600 J, what is the rate of dissipation of energy in the resistor?
A. 1700 W B. 440 W C. 870 W D. 1300 W E. 2200 W
The best way to use a telescope to look for life on other planets is to
a. search for absorption from nitrogen in their atmospheres. b. search for absorption from oxygen in their atmospheres. c. search for emission lines from water vapor in their atmospheres. d. search for carbon dioxide on their moons.
A common opinion concerning the creationism versus evolution controversy is the idea that Earth was created fairly recently but that it was created with fossils and other evidence of great age already present, so that Earth has the appearance of
being very old even though it is really quite young. This opinion is best classified as A) a scientific hypothesis for which there is currently insufficient evidence. B) a scientific opinion that is probably incorrect. C) nonscientific because it contradicts common sense. D) nonscientific because there is no conceivable scientific way to disprove it. E) a scientific opinion that is certainly incorrect.
Lana understands that an object's shape is the same whether she sees it or touches it; that breaking a glass causes a sharp, crashing sound; and that the patter of footsteps signals the approach of a person. This understanding is called